【题目】She has （担心） her daughter (自从) she heard that she dropped out of school.
在线课程【答案】been；concerned/worried；about；ever；since
【解析】句意：从那以后她一直担心她的女儿。be concerned/worried about对……感到担心；ever since从那时到现在。由has可知用过去分词构成现在完成时，所以答案是been concerned about；ever since。